C＃JSON序列必填項

我使用的是內置DataContractJsonSerializer來準備用於傳輸數據。C＃JSON序列必填項

我從一個業務對象使用以下代碼序列化：

private string SerialiseRequest(RegistrationRequest request) 
     { 
      string strRequest = string.Empty; 

      try 
      { 
       DataContractJsonSerializer serializer = new DataContractJsonSerializer(request.GetType()); 

       using (MemoryStream ms = new MemoryStream()) 
       { 
        serializer.WriteObject(ms, request); 
        strRequest = Encoding.Default.GetString(ms.ToArray()); 
       } 
      } 
      catch 
      { 
       return string.Empty; 
      } 

      return strRequest; 
     }

當數據被序列化，它似乎被忽略的設置，最重要的設置是IsRequired，因爲我不希望如果不包含數據，則傳輸一個字段。這裏是我有業務對象定義：

[DataContract] 
    public sealed class RegistrationRequest 
    { 
     [DataMember(Order = 0, IsRequired = true)] 
     public Registration_Header registration_header { get; set; } 

     [DataMember(Order = 1, IsRequired = true)] 
     public Customer_Details primary_user { get; set; } 

     [DataMember(Order = 2, IsRequired = true)] 
     public StaffDetails partner_attributes { get; set; } 

     [DataMember(Order = 3, IsRequired = true)] 
     public CustomerAddress primary_residential_address { get; set; }  

     public class Registration_Header 
     { 
      [DataMember(Order = 0, IsRequired = true)] 
      public string services_required { get; set; } 

      [DataMember(Order = 1, IsRequired = true)] 
      public string account_type { get; set; } 

      [DataMember(Order = 2, IsRequired = true)] 
      public string affiliate_number { get; set; } 
     } 

     public class Customer_Details 
     { 
      [DataMember(IsRequired = true)] 
      public string title { get; set; } 

      [DataMember(IsRequired = true)] 
      public string first_name { get; set; } 

      [DataMember(IsRequired = false)] 
      public string middle_name { get; set; } 

      [DataMember(IsRequired = true)] 
      public string last_name { get; set; } 

      [DataMember(IsRequired = true)] 
      public string email { get; set; } 

      [DataMember(IsRequired = true)] 
      public string nationality { get; set; } 

      [DataMember(IsRequired = true)] 
      public string dob { get; set; } 

      [DataMember(IsRequired = true)] 
      public string occupation { get; set; } 

      [DataMember(IsRequired = true)] 
      public string residence_country { get; set; } 

      [DataMember(IsRequired = true)] 
      public string mobile_number { get; set; } 

      [DataMember(IsRequired = false)] 
      public string landline_number { get; set; } 

      [DataMember(IsRequired = true)] 
      public string source { get; set; } 
     } 

     public class StaffDetails 
     { 
      [DataMember(IsRequired = true)] 
      public string reps_name { get; set; } 

      [DataMember(IsRequired = true)] 
      public string reps_location { get; set; } 

      [DataMember(IsRequired = true)] 
      public string customer_id { get; set; } 
     } 

     public class CustomerAddress 
     { 
      [DataMember(IsRequired = true)] 
      public string postcode { get; set; } 

      [DataMember(IsRequired = true)] 
      public string street_or_address { get; set; } 

      [DataMember(Name = "city", IsRequired = true)] 
      public string city { get; set; } 

      [DataMember(Name = "country", IsRequired = true)] 
      public string country { get; set; } 
     }

下面是我從「SerialiseRequest」方法取回的序列化數據的樣本：

{「registration_header」：{「ACCOUNT_TYPE 「：」單」，「affiliate_number」：「A061535」，「services_required」：「傳輸」}，「primary_user」：{ 「出生日期」：「23-10-1989」，「電子郵件」：「K @大風」「FIRST_NAME」：「凱西」，「landline_number」：「」，「姓氏」：「大風」，「middle_name」：「」，「MOBILE_NUMBER」：「+ 44-79879879879」，「國籍」：「英國」，「職業」：「農夫」，「residence_country」：「英國」，「來源」：「其他」，「標題」：「小姐」}，「partner_attributes」： { 「CUSTOMER_ID」：「273098」，「reps_location」：「斯托克頓北東英」，「reps_name」：「理查德·蓋爾-551」}，「primary_residential_address」：{ 「城市」：「拉克霍爾」，「國家「：」英國」，「郵政編碼」：「ML9 2LS」，「street_or_address」：「1街」}}

來源

2017-07-26 Richard.Gale

哪個字段是必填項，並且在提交的json中爲null？ –

'try ... catch ... return string.Empty'。我的天啊！ –

@JhonatasKleinkauff不需要的2個字段是middle_name和landline_number。正如你在上面的輸出中看到的那樣，它們包含一個空字符串，但是我希望它們在沒有數據的情況下省略。 –

可以使用[DataMember(EmitDefaultValue = false)]attribute。

[DataContract] 
public sealed class RegistrationRequest 
{ 
    [DataMember(Order = 0, IsRequired = true)] 
    public Registration_Header registration_header { get; set; } 

    [DataMember(Order = 1, IsRequired = true)] 
    public Customer_Details primary_user { get; set; } 

    [DataMember(Order = 2, IsRequired = true)] 
    public StaffDetails partner_attributes { get; set; } 

    [DataMember(Order = 3, IsRequired = true)] 
    public CustomerAddress primary_residential_address { get; set; } 

    public class Registration_Header 
    { 
     [DataMember(Order = 0, IsRequired = true)] 
     public string services_required { get; set; } 

     [DataMember(Order = 1, IsRequired = true)] 
     public string account_type { get; set; } 

     [DataMember(Order = 2, IsRequired = true)] 
     public string affiliate_number { get; set; } 
    } 

    [DataContract] 
    public class Customer_Details 
    { 
     [DataMember(IsRequired = true)] 
     public string title { get; set; } 

     [DataMember(IsRequired = true)] 
     public string first_name { get; set; } 

     [DataMember(EmitDefaultValue = false)] 
     public string middle_name { get; set; }  

     [DataMember(IsRequired = true)] 
     public string last_name { get; set; } 

     [DataMember(IsRequired = true)] 
     public string email { get; set; } 

     [DataMember(IsRequired = true)] 
     public string nationality { get; set; } 

     [DataMember(IsRequired = true)] 
     public string dob { get; set; } 

     [DataMember(IsRequired = true)] 
     public string occupation { get; set; } 

     [DataMember(IsRequired = true)] 
     public string residence_country { get; set; } 

     [DataMember(IsRequired = true)] 
     public string mobile_number { get; set; } 

     [DataMember(EmitDefaultValue = false)] 
     public string landline_number { get; set; } 

     [DataMember(IsRequired = true)] 
     public string source { get; set; } 
    } 

    public class StaffDetails 
    { 
     [DataMember(IsRequired = true)] 
     public string reps_name { get; set; } 

     [DataMember(IsRequired = true)] 
     public string reps_location { get; set; } 

     [DataMember(IsRequired = true)] 
     public string customer_id { get; set; } 
    } 

    public class CustomerAddress 
    { 
     [DataMember(IsRequired = true)] 
     public string postcode { get; set; } 

     [DataMember(IsRequired = true)] 
     public string street_or_address { get; set; } 

     [DataMember(Name = "city", IsRequired = true)] 
     public string city { get; set; } 

     [DataMember(Name = "country", IsRequired = true)] 
     public string country { get; set; } 
    } 
}

還要注意，你必須來裝點Customer_Details類[DataContract]它才能生效。

來源

2017-07-26 13:04:47

謝謝埃裏克，我會給你一個旋轉。它確實提出了問題，我是否真的需要爲所有其他元素包含（IsRequired = true）？ –

從我可以從[MSDN文檔]告訴（https://msdn.microsoft.com/en-us/library/system.runtime.serialization.datamemberattribute.isrequired（V = vs.110）的.aspx），它會在讀取或反序列化時檢查並相應地拋出錯誤。取決於你想要在客戶端實施什麼樣的行爲。而另一[鏈接]（https://docs.microsoft.com/en-us/dotnet/framework/wcf/best-practices-data-contract-versioning）關於爲datacontracts- –

@Richard最佳實踐。大風個人而言，我不會使用'IsRequired = true'，除非我真的想強制這個屬性總是在那裏。這意味着從JSON到C＃對象的每個反序列化。 –

的串行只會序列化對象中的數據。它不會在課堂上進行裝飾。當DataContract被髮送回服務時，IsRequired屬性將被觸發。

來源

2017-07-26 12:08:32 padotj

那麼你是說這不是正確的方法來省略沒有數據的字段嗎？ –

啊！請原諒我。我錯過了他說他不想傳輸沒有數據的字段的部分。我認爲Erik有最好的答案。 – padotj

C＃JSON序列必填項

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